<template>
  <div class="login_container">
    <div class="login_box">
      <!--头像区域-->
      <div class="avatar_box">
        <img src="../assets/logo.png" />
      </div>
      <!--登录表单区域-->

      <el-form
        ref="loginFormRef"
        :model="loginForm"
        :rules="loginFormRules"
        label-width="0px"
        class="login_form"
      >
        <!--用户名-->
        <el-form-item prop="username">
          <el-input
            prefix-icon="el-icon-user"
            placeholder="请输入用户名"
            v-model="loginForm.username"
          >
          </el-input>
        </el-form-item>
        <!--密码-->
        <el-form-item prop="password">
          <el-input
            type="password"
            prefix-icon="el-icon-lock"
            placeholder="请输入密码"
            v-model="loginForm.password"
          >
          </el-input>
        </el-form-item>
        <!--按钮区域-->
        <el-form-item class="loginarea">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="reset">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  name: 'Login',
  data: function() {
    return {
      // 这是登陆表单的数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 这是登陆表单的验证规则对象
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10个字符', trigger: 'blur' }
        ],
        // 验证密码是否合法
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    login() {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        // console.log(res)
        if (res.meta.status !== 200) {
          this.$message.error('登录失败')
        } else {
          this.$message.success('登录成功')
        }
        // 1.将登录成功之后的token，保存到客户端的sessionstorage中
        // 1.1项目中除了登录之外的其他API接口，必须在登录之后才能访问
        // 1.2 token 只应在当前网站打开期间生效，所以将 token保存在sessionstorage中
        window.sessionStorage.setItem('token', res.data.token)
        // 2.通过编程式导航(对象)跳转到后台主页，路由地址是/home
        this.$router.push('/home')
      })
    },
    reset() {
      this.$refs.loginFormRef.resetFields()
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  background: #34495e;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background: #0e0d0de8;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.avatar_box {
  width: 130px;
  height: 130px;
  border: 1px solid white;
  border-radius: 50%;
  padding: 10px;
  box-shadow: 0 0 10px #ddd;
  position: absolute;
  transform: translate(-50%, -50%);
  left: 50%;
  background: #fff;
  img {
    width: 100%;
    height: 100%;
    background: #eee;
    border-radius: 50%;
  }
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
.loginarea {
  margin: 30px 0;
  display: flex;
  justify-content: space-around;
}
</style>
